Query excel sheet error

I'm trying to convert an excel date to sql datetime format in a select statement.  The code fails with the following error message: "undefined function convert".  Can anyone offer any advice on how to convert to datetime in an excel query?  Is there another function I should use?
"select name, address from " & "[" & tableName & "]" & "where ((CONVERT(DATETIME, hiredate, 102)) > 5/15/2012)"